[OSM-talk] Data oddness

D Tucny d at tucny.com
Mon Dec 8 14:32:30 GMT 2008


2008/12/8 David Groom <reviews at pacific-rim.net>

>
> ----- Original Message -----
> From: "Andy Street" <mail at andystreet.me.uk>
> To: <talk at openstreetmap.org>
> Sent: Monday, December 08, 2008 11:32 AM
> Subject: [OSM-talk] Data oddness
>
>
> >
> > Hi All,
> >
> > I've noticed something strange occurring with the Northbound A3 near
> > Petersfield, UK[0]. The way in question[1] seems to appear in different
> > states in different programmes. In JOSM and the data browser the way has
> > just two nodes but in Potlatch there are many more. Also, a history call
> > to the API[2] also appears to be missing the current version of the way.
> >
> > As this appears to be some sort of data corruption issue can anyone
> > advise the best way to revert the way without making things worse?
> >
> > Regards,
> >
> > Andy
> >
> > [0]
> >
> http://www.openstreetmap.org/?lat=51.0413&lon=-0.9116&zoom=14&layers=B000FTF
> > [1] http://www.openstreetmap.org/api/0.5/way/28755575
> > [2] http://www.openstreetmap.org/api/0.5/way/28755575/history
>
> Looking at at least one of the nodes shown in the history way
> http://www.openstreetmap.org/api/0.5/way/28755575/history
>
> the node display is shown as false
>
> http://www.openstreetmap.org/api/0.5/node/21076696/history
>

Which means that some of the nodes were deleted from the way but the way
still exists...

The lack of history of a previous version would suggest that either there
was no previous version and the way was created with existing nodes, or that
potlatch removed the previous way and replaced it with a new way which due
to some communication issue then potentially showed as if the nodes were
POIs which the user then deleted after the fact and for whatever reason
allowed the way to be corrupted...

The fix would probably be to undelete the individual nodes that make up the
way...

d
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